Eucalliaxiopsis madagassa ( Sakai and Türkay, 2014 )

Poore, Gary, 2021, Indo-West Pacific and Australian species of Eucalliacidae with descriptions of four new species (Crustacea: Axiidea), Memoirs of Museum Victoria 80, pp. 1-41 : 28

Eucalliaxiopsis madagassa ( Sakai and Türkay, 2014)

Figure 19

Calliaxiopsis madagassa Sakai and Türkay, 2014: 193 , fig. 13. Calliaxina thomassini Ngoc-Ho, 2014: 549, fig. 2.

Calliaxina madagassa .— Poore and Dworschak, 2017: 120, fig. 1.

Material examined. Madagascar. Nosy Bé , W of Hell-Ville, 13.41562° S, 48.24648° E (stn MGNW-50), UF 14090 (ovigerous female, 5.8 mm). Toliara (as Tuléar), Thomassin stn 676, MNHN- IU-2016-8085 (ovigerous female, 5.8 mm) .

Diagnosis. Eyestalk about twice as long as wide. Antennule peduncle reaching to midpoint of antenna peduncle article 5. Maxilliped 3 exopod present. Cheliped carpi distolateral margin square at lower angle, propodi lateral face without longitudinal ridge, upper mesial face with row of clusters of long setae. Male pleopod 1 article 1 without distal setae, article 2 parallel-sided, apically rounded, with marginal setae, without appendix interna. Female pleopod 2, appendix interna absent. Uropod endopod ovate. Telson without transverse row of spiniform setae.

Distribution. Madagascar.

Remarks. Poore and Dworschak (2017) discussed the synonymy and priority of the species names before Calliaxina was divided into two by Poore et al. (2019). The species is widespread in Madagascar ( Ngoc-Ho, 2014) and is recognised by rounded posterolateral corners and convex posterior margin of the telson, the continuous dense row of setae on the lateral margin of the fixed finger of the minor cheliped, and the presence (usually) of two or three tubercles at the midpoint of the lower margin of the cheliped merus. The ovigerous female differs from that of the male figured by Ngoc-Ho (2014) in having a slightly narrower uropodal exopod and in having the chelipeds subequal – they are unequal in males of most species of this genus.

Figures

Figure 19. Eucalliaxiopsis madagassa. Madagascar, UF 14090 (ovigerous female, 5.8 mm): a, b, anterior carapace, eyestalks, antennule, antenna, dorsal and lateral views; c–e, telson, dorsal, posterior and lateral views; f, major (left) cheliped, mesial view; g, major (left) cheliped, propodus, dactylus, lateral view; h, minor (right) cheliped, mesial view; i, minor (right) cheliped, propodus, dactylus, lateral view. Scale bars = 1 mm.