2 новых вида Неолампрологусов (Neolamprologus)

[Yan]

Neolamprologus walteri
Neolamprologus chitamwebwai
Verburg, P & R Bills, 2007

Abstract

Two new cichlid species, Neolamprologus walteri sp. nov. and N. chitamwebwai sp. nov., from the Bangwe peninsula (Tanzania), on the east coast of Lake Tanganyika, are described. Both species belong to the N. savoryi species complex, characterised by a lunate tail with long filaments. Neolamprologus chitamwebwai and N. walteri are highly stenotopic species, restricted to rocky habitat. They occur sympatrically with each other and with two other species of the complex but occupy different microhabitats. Neolamprologus walteri lives in large numbers in sheltered areas with rubble substrate whereas N. chitamwebwai occurs in much lower numbers on more exposed parts of the rocky shores, with large boulders, lower sedimentation rates, coarser sediment, and higher visibility. The two new species although closely related, show clear ecological differentiation. Evidence of ecological differentiation between closely related sympatric cichlids is rare in literature. Closely related sympatric cichlids in the large African lakes (with literature mainly referring to Lake Victoria and Lake Malawi) have been suggested to differ little in diet and habitat use, which has encouraged the idea that cichlid species can coexist without niche partitioning. Our paper provides a different perspective with cichlids from Lake Tanganyika.

Two new cichild species Neolamprologus (Teleostei: Cichlidae) from Lake Tanganyika, East Africa.
Verburg, P & R Bills.
Zootaxa 1612: 25–44, 2007.

[Yan]

В статье есть "ключ" для определения видовой принадлежности неолампрологусов комплекса Neolamprologus savoryi.
Если учесть, что некоторые из них внешне очень похожи, то эта информация частично может помочь любителям. Поэтому я приведу эту таблицу полностью:

Key to the species of the Neolamprologus savoryi complex

1 Marks on operculum....................................................................................................................................2
- Opercular marks absent ..............................................................................................................................8
2 V-shaped mark with bright spot on operculum, >35 scales in the longitudinal line....................................3
- Opercular mark not V-shaped, <35 scales in the longitudinal line..............................................................4
3 Opercular spot red, scales on paired fins, ctenoid scales on anal and dorsal fins......................N. splendens
- Opercular spot yellow, no scales on paired fins, cycloid scales on anal and dorsal fins..........N. helianthus
4 Twelve soft rays in pectoral fin, anal fin filament longer than of dorsal fin, headlength > 34 %SL, 3 scales between lateral lines, bars on body................................................................................................N. savoryi
- Thirteen soft rays in pectoral fin, anal fin filament shorter than of dorsal fin, headlength < 34 %SL, 2 scales between lateral lines, no bars............................................................................................................5
5 Cephalic pits, cheek depth > 28 % HL, opercular mark vague.....................................................N. crassus
- Cephalic pits absent, cheek depth < 28 % HL, opercular marks distinct....................................................6
6 No conspicuous spots on scales, no yellow border under eye, caudal peduncle length >18 %SL................
....................................................................................................................................................N. brichardi
- Conspicuous spots on scales, yellow border under eye (white in preserved specimens), caudal peduncle length <18 %SL...........................................................................................................................................7
7 Scales between pectoral fin and pelvic fin, and between dorsal fin origin and lateral line clearly visible, rows of spots on scales regular.....................................................................................................N. pulcher
- Same scales deeply embedded and not always clearly visible, rows of spots on scales irregular, with interruptions.....................................................................................................................................N. olivaceous
8 No scales on occiput, few scales on nape....................................................................................................9
- Few scales on occiput, many scales on nape.............................................................................................10
9 Distinct black and white marginal bands on dorsal and caudal fin and striped pattern on unpaired fins, pre-orbital depth < 17 % HL, eight to fifteen scales on operculum ....................................................N. walteri
- Faint markings and no distinct black and white marginal bands on unpaired fins, preorbital depth > 17 % HL, 12–30 scales on operculum..................................................................................................N. falcicula
10 Scales around caudal peduncle > 17, gill rakers > 15, 3 scales between lateral lines..................N. gracilis
- Scales around caudal peduncle < 17, gill rakers < 10, 2 scales between lateral lines...............................11
11 Body depth < 29 % SL, headlength > 30 % SL, inter orbital width < 25 % HL, caudal peduncle length/depth ratio >1.25, no scales on unpaired fins and cycloid scales on dorsal and anal fins..N. chitamwebwai
- Body depth > 29 % SL, headlength < 30 % SL, inter orbital width > 25 % HL, caudal peduncle length/depth ratio < 1.10, scales on unpaired fins and ctenoid scales on dorsal and anal fins......N. marunguensis