Joeropsis
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Ordo: Isopoda
Familia: Joeropsididae
Name
Joeropsis Koehler, 1885 – Wikispecies link – Pensoft Profile
- Joeropsis Koehler, 1885: 7. – Kensley and Schotte 1989[1]: 87; Wilson 1997[2]: 86; Kussakin 1999[3]: 12; Just 2001[4]: 304; Kensley and Schotte 2002[5]: 1428.
- Jæropsis. – Richardson 1905[6]: 476; Stebbing 1905[7]: 50.
- Jaeropsis. – Vanhöffen 1914[8]: 531(unjustified emendation). – Nordenstam 1933[9]: 191. – Menzies and Barnard 1959[10]: 10; Menzies 1962[11]: 64; Menzies and Glynn 1968[12]: 76.
- Iaeropsis. – Nierstrasz 1941[13]: 288 (unjustified emendation).
Diagnosis
Body lateral margins parallel, with or without dorsal sculpture. Cuticle polished, smooth or finely granular. Pseudorostrum with overhanging apex. Upper lip evenly rounded, less than twice as wide as long. Mandible incisor with 5 or 6 strong subequal evenly spaced cusps; spine row setae long, in regular row, with or without lobe on right mandible spine row. Lower lip, lobes longer than wide, distally tapering, pointed. Maxillipeds endite reaching to end of or beyond palp article 3; palp about half length of endite; palp article 3 without mesial lobe, article 4 much longer than article 3. Pereopod 1 with 2 dactylar claws, pereopods 2–7 with 2 or 3 dactylar claws.
Female. Pleopod 2 (operculum) with at most a few short simple setae apically.
Type species
Joeropsis brevicornis Koehler, 1885, by monotypy. Menzies (1962)[11] incorrectly stated the type species to be Joeropsis curvicornis (Nicolet, 1849) as did Menzies and Glynn (1968)[12]. The original orthography on the heading page of Koehler (1885)[14] was Joeropsis, thereafter Jœropsis [œ] not Jæropsis [æ], the derivation from Jaera notwithstanding; the two spellings can be indistinguishable depending on the font used, but my interpretation is that in some cases the spelling is ambiguous. I follow the first use—Joeropsis.
Remarks
Most older diagnoses (e.g. Menzies and Barnard 1959[10]) contain little diagnostic information. Wilson (1997)[2] provided the first restrictive diagnosis. Just (2001)[4] gave the most recent generic diagnosis. A full synonymy was given by Kussakin (1999)[3] for family and genus, though spelling changes were largely ignored, and the synonymy includes two identical spellings.
A number of authors have, over the years, recorded species of Joeropsis from widely disparate locations, some commenting on variation, occasionally establishing subspecies. In most such cases the identity of records remote from the type locality or core distribution have to be regarded with caution and scepticism. The records in the literature, particularly earlier than the 1980s, often lack adequate illustrative and descriptive data. Giving just one example, Joeropsis curvicornis (Nicolet, 1849) was recorded from Chile (original record), Sri Lanka (Stebbing 1905[7]) and New Zealand (when Joeropsis neozelanica Chilton, 1891 was considered a junior synonym) but these records are highly unlikely to be the one species.
Maxilliped palp article 3 in most species lacks a distomesial lobe or process, the exception being Joeropsis sanctipauli Kensley, 1989, which has a small distomesial lobe (Kensley 1989[15], fig. 3H). Most species of Joeropsis, including all Australian species (those described here and by Just [2001][4]) have a distomesial lobe only on maxilliped palp article 2, the exception being Joeropsis mije sp. n., which also has a small distolateral lobe on palp article 1 (Fig. 15D, E).
The mandible incisor has five or six distally acute cusps, usually of similar size. Exceptions are Joeropsis indica Müller, 1991b and Joeropsis makrogenys sp. n., both of which have markedly asymmetric mandibular incisors, with a truncate mesial cusp on the left mandible with the remaining cusps set on a lobe; in Joeropsis indica the right mandible cusps are of the usual form, but in Joeropsis makrogenys the right mandible proximal or posterior cusp is conspicuously wide and broadly rounded.
Species recognition
Species within a region are most readily identified by their characteristic colour pattern. Colour pattern is consistent, though shade and density of colour may vary, particularly on preservation. Some species will share similar colour patterns, and for old preserved specimens that have lost the colour pattern morphological characters can be used, the most obvious in the first instance being shape of the pseudorostrum. Other characters that are useful include shape of head (lateral margins narrowing anteriorly, concave, straight; serrate or not), body compactness, antenna 1 and antenna 2 (serrate or not; articles lobed or not; relative width of antenna 2 articles 5 and 6); details of the maxilliped (notably the distal margin of the endite and details of the maxilliped palp), pleotelson shape and serrations of the lateral margins; in some cases the male pleopod 1 will separate species but the differences are often subtle. Eyes are always dorsolateral in position, but vary in size and may be marginal or sub-marginal in position. A small number of species show dorsal sculpting in the form of carinae or low nodules, ventral keels may be present and the uropods may be with (most species) or without (few species) a distomesial spine. Supporting characters can be seen in body proportions and uropods. Generally the mandible is similar throughout the genus, but two species, Joeropsis indica Müller 1991b[16] and Joeropsis makrogenys sp. n. have the proximal cusps on the left mandible incisor set on a lobe, and both species have a comparatively large labrum; additionally the mandibular incisor right proximal cusp is broadly rounded in Joeropsis makrogenys. Pereopods and pleopods are generally uniform throughout the genus, although there are differences in pereopod proportions and setation, including the number of dactylar claws on pereopods 2–7 (2 or 3 claws, and 2 claws with a stiff seta).
Sexual dimorphism
Males and females of Joeropsis are generally similar, other than for the primary sexual characters. There are some instances of secondary sexual variation, for example the strongly dimorphic antenna 2 in Joeropsis mije sp. n. and Joeropsis minuta Müller, 1989 (see Müller 1989[17], fig. 15F, G), while in Joeropsis panstikta sp. n. the males have fewer spines on the pleotelson in comparison to the female.
Key to the Lizard Island species of Joeropsis
This key applies to the named species, 10 of the 15 recorded species in the region. Identifications should be checked against the remarks given for the listed but undescribed species. Inter-reef habitats beyond diving depth are highly likely to have further undescribed species.
Taxon Treatment
- Bruce, N; 2015: Joeropsididae Nordenstam, 1933 (Crustacea, Isopoda, Asellota) from the Lizard Island region of the Great Barrier Reef, Queensland, Australia ZooKeys, (491): 1-62. doi
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Other References
- ↑ Kensley B, Schotte M (1989) Guide to the Marine Isopod Crustaceans of the Caribbean. Smithsonian Institution Press, Washington, D.C. & London, 308 pp.
- ↑ 2.0 2.1 Wilson G (1997) The suborder Asellota. In: Wetzer R Brusca R Wilson G (Eds) Taxonomic Atlas of the Benthic Fauna of the Santa Maria Basin and Western Santa Barbara Channel The Crustacea, Part 2: Isopoda, Cumacea and Tanaidacea. Santa Barbara Museum of Natural History, Santa Barbara, 59–109.
- ↑ 3.0 3.1 Kussakin O (1999) Morskye I solonovatovodnye ravnonogie rakoobrasnye (Isopoda) cholodnix I umerennix vod severnogo polushariya. Tom III. Podotryad Asellota. Chast 2. Joeropsididae, Nannoniscidae, Desmosomatidae, Macrostylidae. Opredeliteli po Faune SSSR. Izdavaemye Zoologischeskim Institutom Rossiiskaya Akademiya Nauk, Saint Petersberg, 384 pp.
- ↑ 4.0 4.1 4.2 Just J (2001) Bathyal Joeropsididae (Isopoda: Asellota) from south-eastern Australia, with description of two new genera. Memoirs of Museum Victoria 58: 297–333.
- ↑ Kensley B, Schotte M (2002) New species and records of Asellota from the Indian Ocean (Crustacea: Peracarida: Isopoda). Journal of Natural History 36: 1421–1461. doi: 10.1080/00222930110050401
- ↑ Richardson H (1905) A monograph on the isopods of North America. Bulletin of the United States National Museum 54: vii–liii, 1–727.
- ↑ 7.0 7.1 Stebbing T (1905) Report on the Isopoda collected by Professor Herdman, at Ceylon, in 1902. Report to the Government of Ceylon on the Pearl Oyster Fisheries of the Gulf of Manaar, 1905 Supplementary Report 4: 47–64.
- ↑ Vanhöffen E (1914) Die Isopoden der Deutschen Südpolar Expedition 1901–1903. Deutschen Südpolar Expedition 7: 447–598.
- ↑ Nordenstam Å (1933) Marine Isopoda of the families Serolidæ, Idotheidæ, Pseudidotheidæ, Arcturidæ, Parasellidæ and Stenetriidæ mainly from the South Atlantic. In: Bock S (Ed.) Further Zoological Results of the Swedish Antarctic Expedition 1901–1903. Norstedt & Söner, Stockholm, 1–284.
- ↑ 10.0 10.1 Menzies R, Barnard J (1959) Marine Isopoda of coastal shelf bottoms of Southern California: systematics and ecology. Pacific Naturalist 1: 3–35.
- ↑ 11.0 11.1 Menzies R (1962) The zoogeography, ecology, and systematics of the Chilean marine isopods. Reports of the Lund University Chile Expedition 1948–49. 42. Lunds Universitets Årsskrifter, NF Avd 2 57: 1–162.
- ↑ 12.0 12.1 Menzies R, Glynn P (1968) The common marine isopod Crustacea of Puerto Rico. Studies on the fauna of Curaçao and other Caribbean Islands 27(104): 1–133.
- ↑ Nierstrasz H (1941) Isopoda Genuina. III. Gnathiidea, Anthuridea, Valvifera, Asellota, Phreatoicidea. In: Weber M De Beaufort L (Eds) Die Isopoden der Siboga-Expedition. E.J. Brill, Leiden, 235–308.
- ↑ Koehler R (1885) Description d’un Isopode nouveau, le Joeropsis brevicornis. Annales des Sciences Naturelles 19: 1–7.
- ↑ Kensley B (1989) Marine isopod crustaceans from the St. Paul and Amsterdam Islands, southern Indian Ocean. Bulletin du Muséum National d’Histoire Naturelle 11: 147–164.
- ↑ Müller H (1991b) Two new species of Joeropsis Koehler from a sabellid reef at the south-west coast of Sri Lanka. Zoologische Abhandlungen Staatliches Museum für Tierkunde Dresden 46: 121–130.
- ↑ Müller H (1989) Joeropsidae from Bora Bora and Moorea, Society Islands, with descriptions of four new species (Isopoda: Asellota). Bijdragen tot de Dierkunde 59: 71–85.
