According to Wiki (oh fabled holder of knowledge), "A black panther is typically a melanistic color variant of any Panthera species." The Panthera species includes tiger, lion, leopard and jaguar. All these big cats can roar.

I love the word melanistic which means dark-colored pigment melanin in the skin or its appendages and is the opposite of albinism. 

Here are some great melanistic cat shifters in Romance. My lists are never in any particular order.  

1. Radar Deception by Mandy M. Roth

Dr. Thaddeus Green survived a werepanther attack long ago, leaving him immortal and a member of the I-Ops team. He’s dedicated his life to genetics and to serving his country. After his mutated DNA led to the death of his loved ones, he vowed to never let anyone close to his heart again. Try as he might, Green is unable to stop the mystical pull to the tall, leggy blonde with a sharp tongue and an even worse bite. Thinking Melanie is suffering from mating withdraw, Green is prepared to do what he must to assure her survival, even if it means claiming her for himself, regardless of his need to protect his heart. Little does Green know that fate has been preparing him for Melanie Daly all his unnaturally long life.

When ghosts from the past resurface, in ways he never dreamt possible, the normally mild-mannered scientist finds himself drawing on his inner beast and rage to assure his mate and their future are protected. But even Green can’t fight all of Melanie’s battles for her. Some she has no choice but to face on her own. Can their bond stand the test of time?

2. Kinked by Thea Harrison

As a harpy, Sentinel Aryal is accustomed to dealing with hate, but Sentinel Quentin Caeravorn manages to inspire in her a burning ire unlike anything she’s ever known. Aryal believes the new Sentinel to be a criminal, and vows to take him out as soon as the opportunity arises. But the harpy’s incessant wrath has pushed Quentin to the limit, and forces him to make a deadly vow of his own.
 
To put an end to the conflict, Dragos, Lord of the Wyr, sends them on a reconnaissance mission to the Elven land of Numenlaur. Forced to work together, Aryal and Quentin’s mutual antagonism escalates. Each fight draws forth more passion—culminating in an explosively sexual confrontation. But when their quest reveals real danger, Aryal and Quentin must resolve their differences in ways beyond the physical, before the entire Wyr is threatened.

3. Marking Melody by R.E. Butler

All were-mountain-lion Melody Marx ever wanted was to find her mate and start a family. After being rescued from her own people by two mountain lions, she knows that she’s found not just one mate, but two. She goes with them to their old home in Pennsylvania, but finds an even chillier reception than she found in Ashland.

Tristan and Micah Harrison would do anything to keep Melody safe, even if it means walking away from the Ashland Pride and their own family forever. When problems arise in their hometown of King, Pennsylvania, it turns out that the males aren’t the only ones who don’t approve of their mating.

4. His Purrfect Mate (by Georgette St. Clair

Chloe Novak may be the world’s clumsiest cat shifter; in fact, she’s the only panther she’s ever heard of that doesn’t land on its feet. She may hide her looks behind her glasses, lumpy cardigans, and stacks of books. However, she’s got her beautifully creaky old house and her university job, and she’s content…until billionaire panther shifter Kenneth Chamberlin strides through her office door with an offer she literally can’t refuse, if she ever wants to see her grandmother alive again. The problem is, the Chamberlin family are the ones who ruined her family’s life and reputation – and the sinfully handsome Kenneth makes her tingle in all the right places. How can she work with him in close quarters and keep her heart and her sanity intact?

5. Magic Dreams by Ilona Andrews

Alpha Pack leader Jim Shrapshire has always been the strong, silent type. But something has come over him--a magic force currently residing in one of the Pack's headquarters. Were-tigress Dali Harimau has always wished she could get Jim's attention--but now he needs her help.

Stricken with a magic-sickness, Jim needs Dali's flair for magic. And to save him, she must challenge a powerful, dark being to a battle of wits.

6. Eat Prey Love by Kerrelyn Sparks

Wanted: Bride. Must love children. Mortals need not apply.

Carlos Panterra is looking for a mate, a woman who will love and care for the young orphans he's recently taken under his wing (or paw, as the case may be). When the shape shifter spies the beautiful Caitlyn, it's like sunshine amidst the darkness. At last, he's found the perfect woman, except . . .

Caitlyn Whelan is mortal. Worse, her father is the head of a CIA agency bent on hunting the undead. Still, Caitlyn knows that Carlos is the man for her, shape shifter or not. So she jumps at the chance when her sister offers her a job to work with him, determined to show Carlos their attraction is more than just animal magnetism. But danger lurks in the night, and their unleashed, untamed passion might just get them both killed . . .

7. The Catalyst by Zoe Winters

Kidnapping is not an appropriate way to acquire a babysitter. Ah, screw it. Desperate times...

Panthers don’t do responsibility. They don’t do long-term relationships. They definitely don’t raise kids. But when Z discovers a young werewolf in the forest, he takes him in, unaware of the powerful beings hunting the pup.

Fiona is a witch who can’t leave her house; the birds have told her something bad will happen. The mailbox is as far as she’ll go, but even that may provide more danger than she’s bargained for. When a wolf pup stumbles into her garden, her safe, wrapped-up world heads for a free fall, especially when a sexy panther shifter kidnaps her to help him look after the pup.

8. Homecoming by Cecilia Robert

Five years ago, twenty-three-year-old panther shifter Sera Czedar left her home and her newly mated groom in a humiliating position after a mating ceremony gone wrong. She built a new life for herself in Varselles, the City of Outcasts where shifters exiled from their clans in the Seven Kingdoms can go for sanctuary.

Five years ago, panther shifter Levian Grayson was abandoned on the bonding bed by his bride, Sera. After years of tracking her, he arrives in Varselles, intent on staking his claim on her once and for all, even if it means hauling her over his shoulder just to make sure that happens.

Sera has always known her homecoming would eventually catch up with her one day. The one thing she can’t bear to do is hurt Levian, which will happen as soon as he finds out the reason she left him. Is she ready to take that path? Most of all, will Levian still want her when the truth comes out?

9. Black Cat Fever by Desiree Holt

10. On The Prowl by Crystal Jordan

Meet the Cruz brothers. They look human--except for the golden sheen their eyes take when they're aroused beyond control...and the way their claws come out when it's time to play rough. They're Panthers, ancient shapeshifters, and their survival depends on mating to bring out their wild sides...

Undeniable

When Antonio, the strong, sexy new leader of the Panther pride, meets luscious Solana in a dark alleyway, their passion lights up the night. But she's an outcast, an impossible mate--and her touch makes him lose all control...

Irresistible

Ex-model and businesswoman Andrea doesn't need anyone--until she meets Miguel, who tempts her mind with daring games and teases her body with dark, forbidden pleasure she can't resist...

Indescribable

Wild twins Ricardo and Diego do everything together--and their women appreciate the teamwork. Until shy Isabel takes refuge in their pride, and both want to claim her. Of course, sometimes two mates are better than one...

Did I miss your favorite? Let me know! Click to Vote: Panther Shifters in Romance.