A New Species of Diaptomus (Copepoda, Calanoida) from Oklahoma and Texas

Abstract

A new species of calanoid copepod, Diaptomus (Aglaodiaptomus) kingsburyae, is described from temporary waters in Oklahoma -and Texas. The new species is closely related to D. clavipes and D. clavipoides. It is separated from these species by diagnostic features of the metasomal wings, the antennules, and the fifth legs. A general description of the armature on all the appendages of this species is presented. An examination of specimens of D. clavipes showed that this description also applies to this species. During previous studies of calanoid copepods (Robertson, 1970, 1972) a collection of zooplankton was obtained from McCurtain Co., Oklahoma, that contained representatives of an undescribed diaptomid species. This species, which has also been found in two locations in Texas, is described in the present report. The new species is named for Dr. Phyllis Kingsbury, whose work (1966, 1968) has contributed greatly to our knowledge of the distribution of calanoids in Oklahoma. Diaptomus (Aglaodiaptomus) kingsburyae, n. sp. Type locality.-Roadside ditch on E side of Oklahoma St. Hwy. 87 in NW quarter of SW quarter of SW quarter of Sec. 19, R27E, T1OS, McCurtain Co., Okla. Specimens examined.-Oklahoma: McCurtain Co., type locality, approximately 200 adults of both sexes, many ovigerous females and many attached spermatophores, 9 May 1970. Texas: Bowie Co., a small pool approximately I/4 mile (0.4 km) from bridge over the Red River along E side of Texas St. Hwy. 8, many adults of both sexes, 27 June 1970; Brazos Co., pond approximately 10 miles (16.1 km) SE of 'College Station, many adults of both sexes, 25 April 1970. Disposition of type.-The holotypic male (U.S.N.M. 136110) and allotypic female (U.S.N.M. 136111) of this species have been deposited in the U.S. National Museum of Natural History, Washington, D.C., as have a series of 10 male and 10 female paratypes (U.S.N.M. 136112). Diagnosis.-With the diagnostic characters of the subgenus Aglaodiaptomus as presented by Wilson (1955). Length (from front of head to base of caudal setae): Male (12 animals examined), range 1.80 1.98 mm, mean 1.90 mm; female (17 animals examined), range 1.83 2.17 mm, mean 2.06 mm. Greatest width of body in region of segment 2 of metasome. Metasomal wings of female not expanded laterally but quite markedly asymmetrical; left wing strongly bifid with inner lobe prominent and clearly reaching beyond outer lobe; right wing much less bifid with the inner lobe only slightly larger than the outer portion and not reaching noticeably beyond it (Figs. 1 and 2). 1 Present address: National Oceanic and Atmospheric Administration, 2300 Washtenaw, Ann Arbor, Mich. 48104.