Aegla rosanae
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Ordo: Decapoda
Familia: Aeglidae
Genus: Aegla
Name
Aegla rosanae Campos Jr., 1998 – Wikispecies link – Pensoft Profile
- Aegla rosanae Moraes, Juliana Cristina Bertacini, 2016, Zootaxa 4193: 15-19.
Materials Examined
Brazil Benfica RS Lima, O & Takeshi & O Campos Jr. Brazil Benfica Brazil Sao Paulo
Description
Geographical distribution. Known only from the type-locality.
Diagnosis
Diagnosis. Rostrum triangular, base narrow, curved upward distally, extending beyond distal apex of compound eyes. Subrostral process on proximal half, well developed, low, broad, triangular, and tip oriented anteriorly. Orbital spines well developed. Epibranchial area with corneous scales on anterolateral angle and on lateral margin. Areola rectangular. Anteromesial region of third thoracic sternite abrupt. Chelipeds moderately large, palmar crests rectangular with margin lobulate. Uropods narrow. Posterolateral margin of telson straight mesially.
Description
Description of male topotype. Carapace moderately convex, gastric region flattened, dorsal surface scabrous, covered with small setae. Rostrum triangular, slightly linguilate, base narrow (value = 0.94), curved upward distally, extending beyond distal apex of compound eyes, with small corneous scales and setae on lateral margins and tip (Figs. 12, 26B). Rostral carina beginning at level of protogastric lobes, extending to near apex, with small simple setae. Subrostral process well developed, on proximal half of subrostral margin, tip rounded and directed anteriorly, anterior and posterior margins forming obtuse angle (116°) (Figs. 13 A, 27B). Eyestalk and cornea well developed. Orbital sinus U-shaped, with plumose setae subventrally. Orbital spines well developed, rounded apically, tipped by small simple setae and minute corneous scale. Anterolateral spines rounded apically, with terminal corneous scale and scattered simple setae, straight, and extending beyond basal margin of cornea (Fig. 12). Epigastric prominences and protogastric lobes pronounced, without corneous scales. Gastric area slightly inflated in relation to hepatic lobes and rostrum in lateral view (Figs. 12, 26B). Gastric pits small and smooth. Demarcation between hepatic lobes well defined. Lateral margins of hepatic lobes with small corneous scales and small setae (Figs. 12, 25B).
Transverse dorsal linea (TDL) sinuous throughout its extension. Areola rectangular (value = 2.59). Cardiac area trapezoidal (value = 1.48) (Figs. 12, 25B). Epibranchial area slightly elongated, triangular shaped, anterolateral angle blunt with a small corneous scale, lateral margin with row of small corneous scales and scattered small simple setae (Figs. 13 B, 28B). Anteromesial region of third thoracic sternite abrupt, with scattered setae. Fourth thoracic sternite with anterolateral angles strongly produced, with scattered setae (Figs. 14 c, 29b). Chelipeds unequal in size (Fig. 12). Major cheliped. Dactylus: dorsal margin and outer surface granulate; inner surface smooth; proximal lobe on dorsal margin blunt; cutting margin with lobular basal tooth well developed proximally, with flattened corneous scales, followed by row of narrow corneous scales up to distal end; row of tufts of long simple setae next to cutting margin. Propodus: outer surface granulate; palm high (value = 3.25); palmar crest rectangular, margin lobulate, outer surface excavated; cutting margin of fixed finger with lobular basal tooth well developed proximally, with flattened corneous scales, followed by row of narrow corneous scales up to distal end; scattered tufts of long simple setae over inner surface, and alongside inner and outer surfaces next to cutting margin. Carpus: dorsal margin with 2 naked tubercles proximally, 2 median spines with terminal corneous scale, 1 tubercle sub-distally with terminal corneous scale, and sub-terminal lobe well defined, blunt, with small corneous scales and setae apically; inner surface with one spine with terminal corneous scale, near dorsal margin and long setae; outer surface with carpal ridge high and formed by tubercles. Merus: dorsal margin with one tubercle; dorsolateral edge with one tubercle with terminal corneous scale distally, three low tubercles with terminal corneous scale, followed by row of tubercles decreasing in size proximally; ventromesial edge with one spine with terminal corneous scale distally, followed by five low naked tubercles; ventrolateral border with two tubercles with terminal corneous scale distally, followed by several small tubercles proximally. Ischium: dorsolateral edge with one naked tubercle distally; ventromesial border with four tubercles (two median ones naked); ventrolateral border smooth.
Minor cheliped similar to major cheliped except as noted hereafter. Dactylus: cutting margin with lobular basal tooth weakly developed proximally. Propodus: cutting margin of fixed finger with lobular basal tooth rudimentary. Carpus: one tubercle with terminal corneous scale on dorsal margin. Merus: dorsolateral edge with one tubercle with terminal corneous scale distally, two low naked tubercles, followed by row of tubercles decreasing in size proximally; ventromesial edge with two merged spines distally with terminal corneous scale on each tip, followed by three medianproximal tubercles with terminal corneous scale. Ischium: ventromesial edge with four tubercles (two distalmost ones with terminal corneous scale). Second, third and fourth pereiopods morphologically similar, except where noted. Dactyli with several rows of setal tufts on general surface. Propodi with small corneous scales on dorsal and ventral margins, and scattered setae concentrated mainly along dorsal and ventral margins. Carpi with scattered setae, concentrated mainly along dorsal margin; second and third pereiopods with small corneous scale on distal portion of dorsal margin. Meri and ischii with scattered setae concentrated mainly along dorsal margin (Fig. 12). Fifth pereiopods reduced and chelate. Dactylus small, flattened, forming setose minute chela with propodus. Sexual tube long, narrow, opening on coxa (Figs. 24C–D). Pleopods 2 through 5 showing as buds. Anterolateral angle of second abdominal epimeron well defined with small corneous scale apically. Ventral angle of third abdominal epimeron well defined with small corneous scale apically. Ventral angle of fourth abdominal epimeron well defined, unarmed apically. Uropods well developed, narrow (13D). Telson with anterolateral and posterolateral margins well differentiated; posterolateral margin straight mesially (Fig. 13 D). Variations. The base of the triangular rostrum is usually narrower than the length of the sides, but in a few specimens the width of the base is larger than the length of the sides (RBW/LMR mean ratio = 0.97 ± 0.04; n = 12). In some individuals (7:12) the anterolateral spines are shorter than usual, only reaching the basal margin of cornea; the areola can be rectangular or subrectangular in shape (mean value = 2.42 ± 0.18; n = 12), and the carpal ridge varies in height. In some individuals the anterolateral and posterolateral margins of the telson are unusually poorly differentiated and the posterolateral margin slightly convex mesially, instead of straight.
Discussion
Remarks.Campos Jr. (1998)and Bond-Buckup & Buckup (2000) referred to the holotype (MZUSP11162) as being a male specimen, whereas it is actually a female specimen. Furthermore, Campos Jr. (1998) mentions that the length of the holotype is 22 mm without specifying whether the measurement refers to carapace length or total body length. The CLE of female holotype is actually 8.80 mm.
Two recent expeditions to the type-locality allowed for the collection of 12 male topotypes whose morphological traits agree well with the female holotype of A. rosanae. They are as follow: (i) rostrum curved upward distally; (ii) subrostral process directed anteriorly; (iii) pronounced protogastric lobes; (iv) epibranchial area with anterolateral angle and lateral margin with small corneous scales; (v) anteromesial region of third thoracic sternite abrupt (Figs. 14 A–D).
Biology and Ecology
Biology. Unknown.
Taxon Treatment
- Moraes, Juliana Cristina Bertacini; Terossi, Mariana; Buranelli, Raquel Corrêa; Mantelatto, Fernando L.; Bueno, Sérgio Luiz De Siqueira; 2016: Morphological and molecular data reveal the cryptic diversity among populations of Aegla paulensis (Decapoda, Anomura, Aeglidae), with descriptions of four new species and comments on dispersal routes and conservation status, Zootaxa 4193: 15-19. doi
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