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Classification
Atyaephyra orientalis Bouvier, 1913
Nomenclature
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Family: AtyidaeGenus: Atyaephyra
SUMMARY
Description. Rostrum long, slender, dorsal margin straight, slightly or strongly curved in the middle and pointed upwards or downwards, 6.0–10.0, most frequently (91% of the individuals examined) 6.5–9.25, × as long as high, shorter or equal to, or longer than scaphocerite (longer in 71% of the individuals examined). 14–29 (18–23 in 80% of the individuals) pre orbital teeth on dorsal margin of rostrum arranged to tip. 0–3, most often (85%) 1–3, post-orbital teeth. 3–13 teeth, mostly (96%) 4–10, arranged on ventral margin of rostrum (Fig. 3A). Carapace smooth with pterygostomial angle not protruding and rounded or bluntly produced (Figs 3B–C). Pleuron of fifth abdominal segment pointed ending in an acute or an obtuse posterior angle (Fig. 3D). Telson with 3–6, predominantly (93%) 4–5, pairs of dorsal spines arranged in curved fashion (Fig. 3E). Distal border of telson with 7–12, most often (91%) 8–10, spines (4–5 pairs) arranged in a fork-like or a fan-like way. Outermost pair of spines shortest, similar to dorsal spines, adjacent pair stronger terminating beyond, along with or before (beyond and along with in 64% of the individuals) the inner finely setulose pairs (Figs 3E–F). Basal segment of antennular peduncle with long stylocerite, with its tip failing to reach, reaching or overreaching the distal end of basal segment. Anterolateral lobe of basal segment short and pointed (Figs 3H–I). Distal segment of antennular peduncle with 0–3, most often (93%) 1–2, spines (Fig. 3G). Basal lower endite of maxilla densely covered with long simple setae arranged in 11–16 (12–15 in 93% of the individuals) oblique parallel rows. Endite of maxilla 1.75–2.20, mostly (93%) 1.81–2.07, × as long as basal lower endite (Fig. 4G). Basal endite of first maxilliped failing or reaching to distal end of exopod distal margin (Fig. 4F). Distal one-third of terminal segment of third maxilliped bearing 10–36 (14–31 in 84% of the individuals), mesial spines and one subdistal lateral spine near the base of larger terminal spine (Fig. 4H). Armature along flexor margin of dactylus of third and fourth pereiopod consisting of 6–11 (7–10 in 97% of the individuals) and 7–11 (8–10 in 89% of the individuals) spines (including terminal spine) respectively (Figs 4B, 4D). Merus of third and fourth pereiopod with 6–10 (7–9 in 85% of the individuals) and 5–9 (6–7 in 83% of the individuals) spines respectively (Figs 4A, 4C). Dactylus of fifth pereiopod with 33–55 (36–49 in 83% of the individuals) spines arranged in comb-like fashion on flexor margin (Fig. 4E). Endopod of first male pleopod expanded proximally with a distal portion stout and not tapering, often, with a, large protruding lobe in its outer subdistal part. Endopod with 13–38 spines arranged on a strongly curved inner margin and 5–8 setae arranged on outer margin (Fig. 4I, Bouvier et al. 1913: Fig. 1). 32–158 eggs of 0.5–0.75 × 0.35–0.5 mm in size.
Size. A. orientalis is a small-medium sized species of Atyaephyra, with maximum carapace length to be 4.8 mm in ♂♂, 6.8 mm in ♀♀ and 5.5 mm in ovig. ♀♀.
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