UK. J, I.N I. NAT. HIST., 1.1: 2001 



PSEUDOCOLLINELLA JORLII (CARLES-TOLRA) (DIPTEH \ 



SPHAEROCERIDAE) NEW TO BRITAIN, AM) NEW RECORDS Of 



SPHAEROCERIDAE FROM KENFIG NATIONAL NAIL RE 



RESERVE, GLAMORGAN 



P. Gatt 



51/ 1 College Street. Rabat . RBT06, Malta. 



Abstract. Eleven species of lesser dung flies (Diptera: Sphaeroceridae) are newly 

 recorded from Kenfig National Nature Reserve, Glamorgan. Of these. Pseudocolli- 

 nella jorlii (Carles-Tolra) is new to Britain, Phthitia plumosula (Rondani) is 

 uncommon, and Telomerina pseudoleucoptera (Duda) is rare. This increases the 

 total number of species of Sphaeroceridae known from Kenfig from 26 to 37. Further 

 collecting and trapping at this faunistically rich site may reveal more species. 



Introduction 



The dipterous fauna of Kenfig National Nature Reserve, Glamorgan, has been 

 extensively studied and a detailed report given by Deeming (1995). It Is therefore of 

 interest to add a further 11 species of Sphaeroceridae (all in the subfamily 

 Limosininae) to the 26 already known from Kenfig. One of these species. 

 Pseudocollinella jorlii (Carles-Tolra) was previously unknown from Britain. 



All specimens were collected by myself during a visit to the site on 10.vii.1995. 

 Representative material has been deposited in the National Museum of Wales. Cardiff. 



Pseudocollinella jorlii (Carles-tolrA) 



The genus Pseudocollinella Duda, 1924, is a Holarctic genus comprising 19 species, 

 5 of which occur in the Palaearctic Region. Until recently, it has been treated as part 

 of Opacifrons Duda (Marshall & Smith, 1993). 



Five species groups have been defined within the genus. P. jorlii. and the very 

 closely related P. Immida (Haliday) constitute the Palaearctic humida group. 



P. humida is a common, hygrophilous species widely distributed in the Palaearctic 

 Region. It is also widely distributed in Britain, where it has been collected from beside 

 ponds and streams, amongst vegetation or on dried-up river beds and on marshes 

 (Pitkin, 1988). Deeming (1995) has recorded a single specimen from Kenfis and I 

 have collected a series of 3 males and 6 females from the mud around Kenfig Pool. 



P. jorlii was first described from Spain (Carles-Tolra, 1990) as Opacifrons jorlii and 

 has subsequently also been recorded from Portugal, Italy, Morocco. Algeria and 

 more recently, from Malta (Gatt, in litt.). Its distribution although probably wide. 

 cannot be stated with certainty as it has previously been confused with humida. I 

 have collected a single female from the area around Kenfig Pool. The occurrence of 

 P. jorlii in Britain was hitherto unknown. 



P. jorlii can be distinguished from the very similar humida by differences in the 

 male and female post-abdominal structures, figured in outline bv Carles-Toha 

 (1990). The female 10th sternite (hypoproct, subanal plate), referred to as sternite 9 

 by Carles-Tolra but now deemed to be sternite 10, is markedly different in both 

 species, and is here refigured with detail for both. In jorlii, the 10th sternite in strict 

 ventral view is horse-shoe shaped with a large, pyriform. anteromedial. desclerotised 

 and depigmented area (Fig. la). In specimens which have been overeleared this area 



