A review of Dendrocephalus (Dendrocephalinus) (Crustacea: Anostraca) with the first records of male-male anostracan aggressive competition Author Rogers, D. Christopher Author Dunn, Ann Author Price, W. Wayne text European Journal of Taxonomy 2019 2019-03-26 509 1 14 journal article 27817 10.5852/ejt.2019.509 094c42ec-da3a-45cf-a48d-079d7b86c5b6 2612812 EA21763A-C185-4650-A075-5B9750640F50 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.