Dendrocephalus (Dendrocephalinus) acacioidea ( Belk & Sissom, 1992 )

Rogers, D. Christopher, Dunn, Ann & Price, W. Wayne, 2019, A review of Dendrocephalus (Dendrocephalinus) (Crustacea: Anostraca) with the first records of male-male anostracan aggressive competition, European Journal of Taxonomy 509, pp. 1-14 : 3

Dendrocephalus (Dendrocephalinus) acacioidea ( Belk & Sissom, 1992)

Fig. 1A, D

Branchinella acacioidea Belk & Sissom, 1992: 312 , figs. 1–3.

Branchinella acacioidea – Belk & Brtek 1995: 323. — Brendonck 1997: 451, 454. — Brtek 1997: 21; 2002: 54. Dendrocephalus (Dendrocephalinus) acacioidea – Rogers 2006: 7, 12, fig. 1D.

Material examined

USA • 15 ♀♀, 11 ♂♂; Texas, Hidalgo County, roadside pool, east side of Texas 281, 12.9 km north of Edenberg ; 26°25΄ N, 98°30΄ W; 21 Aug. 1980; S.L. Sissom leg.; gift from D. Belk; DCR #321 .

Remarks

This species is unique in that the 2A sub-branch (the apical branch) is absent, and sub-branch 2V and 1D are identical. The female shares the elongated brood pouch form with D. proeliator sp. nov. The only member of the subgenus occurring outside the extreme southeastern USA: all records are from southern, coastal Texas. All known locality substrates have 10–15% calcium carbonate and 2–8 mS/cm salinity ( Rogers 2014b).

So far, this species is known from three nearby locations, all seem to be on either private land or in public right of ways ( Belk & Sissom 1992). Due to the limited distribution of D. acacioidea , this species meets the IUCN red list CR B1a,b species criteria (IUCN 2000), which means the species is Critically Endangered, with an extent of occupancy less than 100 km 2, and a projected decline in extent of occurrence.

Figures

Fig. 1. Dendrocephalus spec. A. Dendrocephalus acacioidea, male head, left side, anterior view. B. Dendrocephalus alachua, male head, left side, anterior view. C. Dendrocephalus lithacus, male head, left side, anterior view. D. Dendrocephalus acacioidea, brood pouch, right, lateral view. E. Dendrocephalus alachua, brood pouch, right, lateral view. F. Dendrocephalus lithacus, brood pouch, right, lateral view. G. Dendrocephalus lithacus, male, labrum, ventral view. H. Dendrocephalus lithacus, gonopods, right, lateral view. Scale bar: A–C = 1 mm; D–F, H = 4 mm; G = 0.25 mm.