View source for Hypsibius cf. scabropygus


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{{Publication to wiki notice
 | author = Zawierucha, Krzysztof, Dziamięcki, Jakub, Jakubowska, Natalia, Michalczyk, Łukasz AND Kaczmarek, Łukasz
 | author_abbreviated = Zawierucha K, Dziamięcki J, Jakubowska N, Michalczyk Ł AND Kaczmarek Ł
 | year = 2014
 | title = New tardigrade records for the Baltic states with a description of ''Minibiotus formosus'' sp. n. (Eutardigrada, Macrobiotidae)
 | journal = ZooKeys
 | volume = 408
 | pages = 81--105
 | doi = 10.3897/zookeys.408.6612
 | citationurl = http://www.pensoft.net/journals/zookeys/article/6612/citation/ 
 | url = http://www.pensoft.net/journals/zookeys/article/6612/abstract
 | publisher = Pensoft Publishers
 | publisherurl = http://www.pensoft.net/
}}					

{{Treatment start
 | Ordo = 
 | Familia = 
 | Genus = Hypsibius
 | Specific name = scabropygus
 | Infraspecific name = 
 | Taxon rank = 	
 | Taxon authority = Cuénot, 1929
 | Taxon status = 
 | Wikispecies page name = Hypsibius_cf._scabropygus
 | Pensoft Profile = Hypsibius_cf._scabropygus
}}

==Localities and specimen numbers==
XI: 1 simplex, XII: 1 specimen, XIV: 34 specimens (including 4 simplexes), XV: 24 specimens (including 6 simplexes).

==Description==
'''(measurements in Table 1). Adults.''' Body transparent/white (after preparation), eyes present in 6 of 15 (40%) specimens mounted in Hoyer’s medium (Fig. 1). Dorsal cuticle sculptured: from head to legs II without tubercles but clearly thickened, from legs II to the caudal end of the body (including legs IV) with irregular tubercles and platelets. Tubercles increasing in size from the anterior to the posterior part of the body, reaching maximum dimensions between legs III and IV, where tubercles sometimes merge and form irregular platelets (Figs 2–5). Irregular tubercles 1.0–6.0 μm in diameter. Ventral cuticle smooth (i.e. without sculpturing). Gibbosities and cuticular pores absent.
{| class="wikitable" ; style="width: 100%"
|+ '''Table 1.''' Measurements and ''pt'' values of selected morphological structures of ''{{Taxon name|Hypsibius}}'' cf. ''scabropygus'' Cuénot, 1929 mounted in Hoyer’s medium (N – number of specimens/structures measured, RANGE refers to the smallest and the largest structure among all measured specimens; SD – standard deviation).
|-
! CHARACTER !! N !! RANGE !! MEAN !! SD
|-
! µm !! ''pt'' !! µm !! ''pt'' !! µm !! ''pt''
|-
| Body length || 14 || 183 || – || 293 || ''808'' || – || ''1132'' || 235 || ''949'' || 33 || ''97''
|-
| Buccopharyngeal tube || || || || || || || || || || || 
|-
| Buccal tube length || 15 || 22.0 || – || 28.2 || || – || || 24.6 || – || 2.0 || –
|-
| Stylet support insertion point || 15 || 12.0 || – || 15.9 || ''51.3'' || – || ''57.1'' || 13.5 || ''54.9'' || 1.1 || ''1.6''
|-
| Buccal tube external width || 15 || 1.5 || – || 2.0 || ''6.5'' || – || ''8.0'' || 1.8 || ''7.2'' || 0.2 || ''0.5''
|-
| Buccal tube internal width || 15 || 0.6 || – || 0.9 || ''2.1'' || – || ''3.4'' || 0.7 || ''2.7'' || 0.1 || ''0.4''
|-
| Placoid lengths || || || || || || || || || || || 
|-
| Macroplacoid 1 || 15 || 1.8 || – || 3.2 || ''7.7'' || – || ''12.3'' || 2.4 || ''9.6'' || 0.4 || ''1.3''
|-
| Macroplacoid 2 || 15 || 1.7 || – || 2.7 || ''7.2'' || – || ''11.3'' || 2.2 || ''8.9'' || 0.3 || ''1.1''
|-
| Macroplacoid row || 15 || 4.7 || – || 6.3 || ''19.1'' || – || ''26.5'' || 5.3 || ''21.7'' || 0.5 || ''1.8''
|-
| Claw 1 lengths || || || || || || || || || || || 
|-
| External base || 14 || 2.2 || – || 4.5 || ''9.1'' || – || ''17.2'' || 3.5 || ''14.1'' || 0.7 || ''2.1''
|-
| External primary branch || 14 || 4.0 || – || 8.8 || ''18.2'' || – || ''36.1'' || 6.9 || ''28.1'' || 1.5 || ''5.0''
|-
| External secondary branch || 14 || 2.3 || – || 5.9 || ''10.5'' || – || ''24.4'' || 4.4 || ''17.9'' || 1.0 || ''3.9''
|-
| Internal base || 12 || 2.1 || – || 4.1 || ''9.3'' || – || ''15.5'' || 3.3 || ''13.4'' || 0.6 || ''1.8''
|-
| Internal primary branch || 12 || 3.8 || – || 5.9 || ''16.0'' || – || ''23.5'' || 4.8 || ''19.3'' || 0.6 || ''2.0''
|-
| Internal secondary branch || 12 || 2.4 || – || 4.3 || ''9.9'' || – || ''16.5'' || 3.3 || ''13.3'' || 0.6 || ''2.0''
|-
| Claw 2 lengths || || || || || || || || || || || 
|-
| External base || 11 || 3.0 || – || 5.2 || ''12.4'' || – || ''19.9'' || 4.1 || ''16.7'' || 0.7 || ''2.2''
|-
| External primary branch || 13 || 6.7 || – || 10.4 || ''29.7'' || – || ''43.7'' || 8.5 || ''34.7'' || 1.3 || ''4.4''
|-
| External secondary branch || 13 || 4.3 || – || 6.7 || ''19.0'' || – || ''27.2'' || 5.4 || ''21.9'' || 0.7 || ''2.6''
|-
| Internal base || 10 || 2.4 || – || 4.5 || ''10.9'' || – || ''18.9'' || 3.6 || ''14.6'' || 0.7 || ''2.2''
|-
| Internal primary branch || 12 || 4.0 || – || 6.7 || ''17.7'' || – || ''27.2'' || 5.4 || ''22.0'' || 0.9 || ''2.9''
|-
| Internal secondary branch || 12 || 2.6 || – || 5.4 || ''11.8'' || – || ''22.0'' || 4.1 || ''16.7'' || 0.9 || ''3.0''
|-
| Claw 3 lengths || || || || || || || || || || || 
|-
| External base || 9 || 2.7 || – || 6.2 || ''11.9'' || – || ''23.8'' || 4.3 || ''17.3'' || 1.0 || ''3.5''
|-
| External primary branch || 9 || 7.2 || – || 10.4 || ''29.3'' || – || ''43.7'' || 8.8 || ''35.7'' || 1.1 || ''4.4''
|-
| External secondary branch || 9 || 3.6 || – || 6.5 || ''12.8'' || – || ''27.3'' || 5.2 || ''21.0'' || 1.0 || ''4.3''
|-
| Internal base || 11 || 2.3 || – || 4.1 || ''10.5'' || – || ''17.2'' || 3.4 || ''13.9'' || 0.6 || ''1.9''
|-
| Internal primary branch || 13 || 3.8 || – || 6.5 || ''17.3'' || – || ''27.3'' || 5.4 || ''21.8'' || 0.9 || ''3.1''
|-
| Internal secondary branch || 12 || 2.7 || – || 6.1 || ''12.2'' || – || ''24.8'' || 3.9 || ''16.0'' || 0.9 || ''3.5''
|-
| Claw 4 lengths || || || || || || || || || || || 
|-
| Anterior base || 13 || 3.3 || – || 5.6 || ''12.8'' || – || ''20.1'' || 4.1 || ''16.8'' || 0.6 || ''2.2''
|-
| Anterior primary branch || 13 || 4.4 || – || 7.5 || ''19.5'' || – || ''31.1'' || 5.9 || ''24.2'' || 1.1 || ''3.9''
|-
| Anterior secondary branch || 11 || 3.1 || – || 13.2 || ''13.0'' || – || ''47.3'' || 4.8 || ''18.9'' || 2.9 || ''9.7''
|-
| Posterior base || 12 || 2.7 || – || 5.4 || ''12.3'' || – || ''21.5'' || 4.5 || ''18.2'' || 0.9 || ''3.1''
|-
| Posterior primary branch || 12 || 4.9 || – || 14.9 || ''22.0'' || – || ''60.6'' || 10.3 || ''41.9'' || 2.9 || ''11.2''
|-
| Posterior secondary branch || 12 || 4.0 || – || 6.5 || ''15.4'' || – || ''25.6'' || 5.2 || ''21.2'' || 0.9 || ''3.4''
|} Bucco-pharyngeal apparatus of the ''{{Taxon name|Hypsibius}}'' type, without the ventral lamina, and with forked apophyses for stylet muscles (Fig. 6). Peribuccal lamellae absent. Teeth in the oral cavity armature absent or not visible under PCM. Pharyngeal bulb with apophyses and with two granular macroplacoids (both, without constrictions). Macroplacoid length sequence 2<1. Microplacoid and septulum absent. Claws of the ''{{Taxon name|Hypsibius}}'' type, internal claws much smaller and of a different shape than the external claws (Fig. 7). All main branches with large accessory points. Smooth, indistinct areoles under claws usually visible only on posterior claws IV. Cuticular bars under claws I-III absent but a small bar is present near the posterior claw IV (Fig. 7, arrow).<br />
'''Eggs.''' Unknown.

==Remarks==
''{{Taxon name|Hypsibius scabropygus}}'' has been recorded from many localities, mostly in the Holarctic (McInnes 1994<ref name="B41">{{aut|McInnes S}} (1994) Zoogeographic distribution of terrestrial/freshwater tardigrades from current literature. Journal of Natural History 28: 257-352. doi: 10.1080/00222939400770131</ref >). In general, our specimens correspond to the original description by Cuénot (1929<ref name="B8">{{aut|Cuénot L}} (1929) Description d’un tardigrade nouveau de la faune francaise. Archives d’anatomie Microscopique 25: 121-125.</ref >, 1932<ref name="B9">{{aut|Cuénot L}} (1932) Tardigrades. In: Lechevalier P (Ed) Faune de France 24: 1-96.</ref >) and later descriptions by Marcus (1930)<ref name="B39">{{aut|Marcus E}} (1930) Beiträge zur Tardigradensystematik. Zoologische Jahrbuecher Systematik 59: 363-386.</ref > (<nowiki>=</nowiki>''{{Taxon name|Hypsibius callimerus}}'' spec. nov.), and by Ramazzotti and Maucci (1983)<ref name="B77">{{aut|Ramazzotti G}}, {{aut|Maucci W}} (1983) Il Phylum Tardigrada. Memorie dell’Istituto Italiano di Idrobiologia 41: 1-1012.</ref >. However, importantly, none of the above mentioned descriptions reported a bar between anterior and posterior claws IV, which is present in all our specimens. Given the bar is small, it is possible that it was overlooked by Cuénot and later authors. If, however, ''{{Taxon name|Hypsibius scabropygus}}'' does not have the bar, then our specimens should probably be classified as a new species. Thus, until ''{{Taxon name|Hypsibius scabropygus}}'' is redescribed, our Latvian and Estonian records should be regarded as ''{{Taxon name|Hypsibius}}'' cf. ''scabropygus''. As there is a possibility of our specimens belonging to a new species, we provide standard morphometrics (Table 1) and photographs (Figs 1–7).					

==Taxon Treatment==
*{{aut|Zawierucha, K}}; {{aut|Dziamięcki, J}}; {{aut|Jakubowska, N}}; {{aut|Michalczyk, Ł}}; {{aut|Kaczmarek, Ł}}; 2014: New tardigrade records for the Baltic states with a description of ''Minibiotus formosus'' sp. n. (Eutardigrada, Macrobiotidae) [http://www.pensoft.net/journals/zookeys/ ''ZooKeys'',] '''408''': 81-105. {{doi|10.3897/zookeys.408.6612}}

==Other References==

<references />

==Images==
{{Gallery | lines=5 | width=250
|1= File:zookeys-408-081-g001.jpg|2= '''Figures 1–5.''' ''{{Taxon name|Hypsibius}}'' cf. ''scabropygus'' Cuénot, 1929: '''1''' habitus (dorso-lateral view) '''2–4''' caudo-dorsal cuticle with distinct sculpturing – tubercles and tubercles merged into platelets '''5''' a single caudo-dorsal platelet. ('''1–3:''' PCM, '''4–5:''' SEM).
|3= File:zookeys-408-081-g002.jpg|4= '''Figures 6–7.''' ''{{Taxon name|Hypsibius}}'' cf. ''scabropygus'' Cuénot, 1929: '''6''' bucco-pharyngeal apparatus (dorso-ventral projection, ventral placoids in the insert) '''7''' claws IV (arrow indicates a small cuticular bar near the posterior claw). (Both PCM).
}}